Numbers 35:6-25

The cities which you shall give to the Levites shall be the six cities of refuge, which you shall provide for the one who commits manslaughter to flee to; and in addition to them you shall give forty-two cities. The total number of the cities which you are to give to the Levites shall be forty-eight cities, together with their pasture lands. As for the cities which you shall give them from the possession of the sons of Israel, you shall take more from the larger, and you shall take fewer from the smaller; each shall give some of his cities to the Levites in proportion to his inheritance which he possesses.” Then the LORD spoke to Moses, saying, “Speak to the sons of Israel and say to them, ‘When you cross the Jordan into the land of Canaan, then you shall select for yourselves cities to be your cities of refuge, so that the one who commits manslaughter by killing a person unintentionally may flee there. The cities shall serve you as a refuge from the avenger, so that the one who commits manslaughter does not die until he stands before the congregation for trial. So the cities which you are to provide shall be six cities of refuge for you. You shall provide three cities across the Jordan, and three cities in the land of Canaan; they are to be cities of refuge. These six cities shall be a refuge for the sons of Israel, for the stranger, and for the foreign resident among them; so that anyone who kills a person unintentionally may flee there. ‘But if he struck him with an iron object, so that he died, he is a murderer; the murderer must be put to death. And if he struck him with a stone in the hand, by which he would die, and as a result he did die, he is a murderer; the murderer must be put to death. Or if he struck him with a wooden object in the hand, by which he would die, and as a result he did die, he is a murderer; the murderer must be put to death. The blood avenger himself shall put the murderer to death; he himself shall put him to death when he meets him. Now if he pushed him in hatred, or he threw something at him with malicious intent, and as a result he died, or if he struck him with his hand with hostility, and as a result he died, the one who struck him must be put to death; he is a murderer. The blood avenger shall put the murderer to death when he meets him. ‘But if he pushed him suddenly, without hostility, or threw any object at him without malicious intent, or had any deadly stone, and without looking he dropped it on him so that he died, while he was not his enemy nor was he seeking to harm him, then the congregation shall judge between the one who fatally struck the victim and the blood avenger in accordance with these ordinances. And the congregation shall save the one who committed manslaughter from the hand of the blood avenger, and the congregation shall return him to his city of refuge to which he fled; and he shall live in it until the death of the high priest who was anointed with the holy oil.